Had a brief interview with a riddle shortly after first talking with the recruiter. After being invited to their Vienna HQ for a final technical interview, I was declined an offer even though I felt like I had a really good experience at the final interview. The final technical involved a few riddles, a few C coding questions, a written test, and talks with some of their top level technical execs.

Contacted by recruiter, initially set up short phone call (~15 minutes). Did a hackerrank challenge, after that, scheduled a phone interview with the manager (~1 hour). Was told I would hear back from them very soon, and I never heard from them again.